Answer:
The correct order of energy changes would be:
Potential energy → kinetic energy → mechanical energy → electrical energy.
In hydroelectric plants, water is usually reserved in constructions like a dam. Thus, water possesses potential energy.
The water is released under gravitational force due to which it possesses kinetic energy.
This kinetic energy of water is used to rotate the turbines of a hydroelectric generator.
Thus, the turbines possess mechanical energy which is converted into electrical energy with the help of magnetic field interactions.
This electrical energy is then amplified with the help of transformers and is supplied to the houses, buildings et cetera.